# CVE-2021-47986: Parse Server - Unreviewed Code Execution via Malicious Version Tags

> Attackers can execute malicious code by exploiting incorrect version tags in Parse Server dependencies, requiring users to upgrade to secure versions.

- **Severity:** High 7.7 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 25 Jun 2026
- **Updated:** 26 Jun 2026
- **Also known as:** GHSA-g938-h978-wf7v

## What is CVE-2021-47986?

CVE-2021-47986 is a high-severity vulnerability in Parseplatform Parse-Server, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Parse Server before 4.10.0 contains a supply chain vulnerability where incorrect version tags were pushed to the repository linking to unreviewed code in a personal fork. Attackers could exploit this by specifying affected version tags in dependency declarations to execute unreviewed and potentially malicious code.

Weakness: CWE-494 (Download of Code Without Integrity Check)

## Which versions are affected by CVE-2021-47986?

It affects 1 product.


Products: Parseplatform Parse-Server.

## How do I fix CVE-2021-47986?

Upgrade to a fixed version.

## Is CVE-2021-47986 being exploited?

There is no known exploitation of CVE-2021-47986 in the wild and no public exploit code.

## Other vulnerabilities in Parseplatform Parse-Server

- [CVE-2026-30966](https://insights.sbomify.com/CVE-2026-30966/): Parse Server role escalation and CLP bypass via direct `_Join` table write (critical 10.0)
- [CVE-2024-27298](https://insights.sbomify.com/CVE-2024-27298/): Parse Server literalizeRegexPart SQL Injection (critical 10.0)
- [CVE-2022-24760](https://insights.sbomify.com/CVE-2022-24760/): Command Injection in Parse server (critical 10.0)
- [CVE-2026-30965](https://insights.sbomify.com/CVE-2026-30965/): Parse Server session token exfiltration via `redirectClassNameForKey` query parameter (critical 9.9)
- [CVE-2023-36475](https://insights.sbomify.com/CVE-2023-36475/): Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47986 and fix it if it is affected.

What it is: CVE-2021-47986 is a high-severity vulnerability in Parseplatform Parse-Server, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-47986 in the wild and no public exploit code.

Affected product: Parseplatform Parse-Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-47986/ (Markdown: https://insights.sbomify.com/CVE-2021-47986/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47986
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47986
- OSV: https://osv.dev/vulnerability/CVE-2021-47986

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-47986/
Summaries are generated and may contain mistakes; the official description above is the record.